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Ceramic microstructures and their elucidation by imaging, diffraction and spectroscopic methods

Description: The development and potential utilization of ceramic materials is dependent on a systematic effort involving processing, characterization and appropriate property measurements. The methods of characterization are numerous and it is important to employ the one that is appropriate to the problem both in terms of its information content and the achievable level of resolution. With the incorporation of fine probe forming capabilities in a transmission electron microscope and the development of rela… more
Date: February 1, 1992
Creator: Kirshnan, K.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Homogenization of arc-melted uranium-6 weight percent niobium alloy ingots

Description: Microsegregation and macrosegregation in uranium-6 niobium arc-melted ingots were characterized by electron microprobe analysis. Homogenization studies determined that microsegregation can be eliminated by heat treating the alloy for six hours at 1100/sup 0/C. Extensive homogenization did not eliminate macrosegregation (banding) from the as-cast alloy, but a mathematical model describing banding and coring indicated that banding could possibly be eliminated by working prior to homogenization.
Date: January 31, 1978
Creator: Snyder, W. B., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of significantly improved catalysts for coal liquefaction and upgrading of coal extracts. Quarterly progress report No. 4, July 1-September 30, 1982

Description: Cold flow ebullation tests to determine the ranges of operability of bead catalysts continued. Data reported show the effects of higher catalyst density, wider particle size distributions, and higher fluid viscosity on ebullation of bead catalysts. A relation for determining limiting diameters in a liquid-solid fluidized bed was developed. Correlation of the three-phase data is being investigated. The CSTR Catalyst Aging Test Unit is described. The system operates under computer control. High p… more
Date: January 1, 1982
Creator: Sinha, V. T.; Kutzenco, P. D.; Preston, W. J.; Brinen, J. S.; Graham, S. W.; Butensky, M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synthesis and characterization of a covalently bound self-assembled macrocycle monolayer thin film for nonlinear optical materials

Description: Synthesis and characterization of covalently bound self-assembled, 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphine monolayer superlattices on various oxide surfaces such as fused silica, glass or silicon are described. The mono-molecular thin film structures are characterized by UV-visible ({lambda}{sub max} = 447 nm) and FTIR-ATR spectroscopy. In addition, X-ray photoelectron spectroscopy and secondary ion mass spectroscopy studies are used to confirm the formation of a self-assembled monolayer o… more
Date: January 1, 1992
Creator: Li, DeQuan; Swanson, B. I.; Robinson, J. M. & Hoffbauer, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Physical and chemical characterization of synthetic calcined sludge

Description: Calcined synthetic sludge was chemically characterized in support of engineering studies to design a processing plant to solidify highly radioactive waste at the Savannah River Plant. An analytical technique is described which provides quantitative data by mass spectrometric analysis of gases evolved during thermogravimetric analysis without measurements of gas flow rates or mass spectrometer sensitivities. Scanning electron microprobe analysis, Mossbauer spectroscopy, and several other common … more
Date: March 1, 1982
Creator: Slates, R.V.; Mosley, W.C. Jr.; Tiffany, B. & Stone, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lung cancer in uranium miners and the implications of the U/V ratio in uranium-bearing particles

Description: Several geological formations mined for uranium ore during and after the second World War had been mined earlier for vanadium. Most miners and millers from the Utah-Colorado mining region worked with this ore or its tailings at one time or another. Preliminary investigation to determine the size and location of uranium-bearing particles retained in the lungs of a former uranium miner and miller from this region, who died of lung cancer (mesothelioma), showed a high nonuniform distribution of va… more
Date: January 1, 1985
Creator: Paschoa, A. S.; Wrenn, M. E.; Singh, N. P.; Bruenger, F. W.; Miller, S. C.; Cholewa, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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MIIT: International in-situ testing of simulated HLW forms - performance of SRS simulated waste glass after 6 mos. , 1 yr. , 2 yrs. and 5 yrs. of burial at WIPP

Description: The first field test, involving burial of simulated high-level waste (HLW) forms and package components, to be conducted in the United States, was begun in July of 1986. This program, called the Materials Interface Interactions Test or MIIT, comprises the largest cooperative field-testing venture in the international waste management community. Included in the study are over 900 waste form samples comprising 15 different systems supplied by 7 countries. Also included are about 300 potential can… more
Date: January 1, 1991
Creator: Wicks, G.G. (Westinghouse Savannah River Co., Aiken, SC (United States)); Lodding, A.R. (Chalmers Univ. of Technology, Goeteborg (Sweden)); Macedo, P.B. (Catholic Univ. of America, Washington, DC (United States)) & Clark, D.E. (Florida Univ., Gainesville, FL (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of significantly improved catalysts for coal liquefaction and upgrading of coal extracts

Description: During 1979-80, a new generation of very active, long-lived catlaysts for hydrotrating was discovered at the Stamford Research Laboratories of the American Cyanamid Company. The catalysts are based on a unique substrate prepared in bead form from a rehydratable alumina. Their spherical shape, crush strength, and abrasion resistance seem ideally suited for the ebullated bed reactors used in the H-COAL process developed by Hydrocarbon Research, Inc. (HRI). The beads have internal pore structures … more
Date: January 1, 1982
Creator: Sinha, V. T.; Kutzenco, P. D.; Preston, W. J.; Brinen, J. S.; Graham, S. W.; Butensky, M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Use of a synchrotron radiation x-ray microprobe for elemental analysis at the National Synchrotron Light Source

Description: The National Synchrotron Light Source (NSLS) is a facility consisting of a 700 MeV and a 2.5 GeV electron storage ring and dedicated to providing synchrotron radiation in the energy range from the vacuum ultraviolet to high energy x rays. Some of the properties of synchrotron radiation that contribute to its usefulness for x-ray fluorescence are: a continuous, tunable energy spectrum, strong collimation in the horizontal plane, high polarization in the storage ring plane, and relatively low ene… more
Date: January 1, 1980
Creator: Gordon, B. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The role of high-energy synchrotron radiation in biomedical trace element research

Description: This paper will present the results of an investigation of the distribution of essential elements in the normal hepatic lobule. the liver is the organ responsible for metabolism and storage of most trace elements. Although parenchymal hepatocytes are rather uniform histologically, morphometry, histochemistry, immunohistochemistry, and microdissection with microchemical investigations have revealed marked heterogeneity on a functional and biochemical level. Hepatocytes from the periportal and pe… more
Date: January 1, 1987
Creator: Pounds, J. G.; Long, G. J.; Kwiatek, W. M.; Jones, K. W.; Gordon, B. M. & Hanson, A. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Petrology, geochronology, and chemical evolution of the Twin Peaks Rhyolite Domes, Utah

Description: Two distinct sequences of silicic volcanism at the Twin Peaks volcanic field, Millard County, Utah, spanned periods from 2.74 +- .10 to 2.54 +- .09 m.y. and 2.43 +- .08 to 2.35 +- .08 m.y., and produced a total exposed volume of 4 km/sup 3/ of rhyolites and volcanoclastics. Wet chemical, x-ray fluorescence, microprobe, atomic absorption, and neutron activation methods have been employed to obtain a wide range of chemical data on whole rock and mineral separate samples. Calculated distribution c… more
Date: May 1, 1980
Creator: Crecraft, H. R.; Nash, W. P. & Evans, S. H., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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(Energy related studies utilizing microline thermochronology)

Description: In our first year of the current funding cycle, we have investigated three interrelated aspects of K-feldspar thermochronology; (1) the Ar diffusion properties and microstructures of K-feldspars, (2) the thermal evolution of the Valles Caldera and (3) the continued development of microanalysis. Results of TEM and light microscopy on heated and unheated samples of MH-10 K-feldspar reveal three classes of substructure are present: (1) cross hatched extinction is common and there is almost no albi… more
Date: January 1, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chemical durability of Savannah River Plant waste glass as a function of waste loading

Description: The leachability of Savannah River Plant (SRP) waste forms was assessed for glass containing up to 50 wt % simulated waste oxides. Leach tests included standard MCC-1 static tests and pH-buffered solution experiments. An integrated approach combining leachate solution analysis with both bulk and surface analyses was used to study waste glass corrosion as a function of waste loading. Leachate solutions were analyzed by inductively coupled plasma spectroscopy and atomic absorption. Bulk and surfa… more
Date: January 1, 1982
Creator: Rankin, W D & Wicks, G G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Chemical durability of Savannah River Plant waste glass as a function of groundwater pH

Description: The leachability of Savannah River Plant (SRP) waste glass was assessed for leachants in the pH range of 3 to 11. A parabolic relationship was observed between leachability and solution pH in this range. At 40/sup 0/C, leachability was lowest within a pH range of approximately 5 to 9. Most of the groundwaters in potential repository locations have pH values in this range. Below pH 5 and above pH 9, leachability of the waste glass increases. Leachability as a function of solution pH was studied … more
Date: January 1, 1982
Creator: Wicks, G. G.; O'Rourke, P. E. & Whitkop, P. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CdSiAs/sub 2/ thin films for solar cell applications. Second quarter report, July 1, 1979-September 30, 1979. [CdSiAs/sub 2//CdS]

Description: Sputtered films have been formed with two improved composite (Si + CdAs/sub 2/) targets. Near stoichiometric and mechanically continuous CdSiAs/sub 2/ films have been formed on metal substrates. Films of this type will be used over the next reporting period for heterojunction formation. Evaporation studies related to CdAs/sub 2/ have been completed. Stoichiometric CdAs/sub 2/ films could not be formed by means of single-source evaporation of CdAs/sub 2/ bulk. Hence, this dual source approach (S… more
Date: October 1, 1979
Creator: Burton, L.C. & Slack, L.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An X-Ray Microprobe Beam Line for Trace Element Analysis

Description: The application of synchrotron radiation to an x-ray microprobe for trace element analysis is a complementary and natural extension of existing microprobe techniques using electrons, protons, and heavier ions as excitation sources for x-ray fluorescence. The ability to focus charged particles leads to electron microprobes with spatial resolutions in the sub-micrometer range and down to 100 ppM detection limits and proton microprobes with micrometer resolution and ppM detection limits. The chara… more
Date: January 1, 1987
Creator: Gordon, B. M.; Hanson, A. L.; Jones, K. W.; Kwiatek, W. M.; Long, G. J.; Pounds, J. G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Quality engineering and control. Semiannual progress report, November-December 1978, January-April 1979. [PCB]

Description: This document reports the following: atomic absorption spectroscopy of Ir in Pu-Ir alloys; removal of Pu from soil; surface microanalysis using elemental x-ray mapping; microscopic scanning of Ga in Pu; microscopy of defects in Pu; emission spectroscopy of Ir and Y in PuO/sub 2/; gas chromatograhy of PCB's in transformer oils and water; liquid chromatography of chlorophenoxy acid herbicides in water; solution analysis by spark source mass spectrometry; a portable gas sampling system; flamm… more
Date: August 2, 1980
Creator: Carpenter, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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EE Technical Review

Description: Areas of research reported include: ultrafast gating of microchannel plate x-ray spectrometers, study of power MOS fast switching techniques, lightning vulnerability of nuclear explosive test systems at the Nevada Test Site, and a computer model of the MFTF-B neutral beam accel dc power supply.
Date: June 1, 1985
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High level waste properties

Description: Devitrification and leaching analyses of four waste glasses were made to compare non-radioactive compositions to compositions made using fully radioactive waste calcine. Microstructural analyses of the phase behavior of glasses were performed by means of optical microscopy, x-ray diffraction, x-ray fluorescence, scanning electron microscopy, and electron microprobe analysis. The author's summary of the major findings are: Melt insoluables and crystallization products were found to the same exte… more
Date: January 1, 1979
Creator: Turcotte, R.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of synchrotron x-ray microanalysis with electron and proton microscopy for individual particle analysis

Description: This paper is concerned with the evaluation of the use of synchrotron/radiation induced x-ray fluorescences ({mu}-SRXRF) as implemented at two existing X-ray microprobes for the analysis of individual particles. As representative environmental particulates, National Institutes of Science and Technology (NIST) K227, K309, K441 and K961 glass microspheres were analyzed using two types of X-ray micro probes: the white light microprobe at beamline X26A of the monochromatic (15 keV) X-ray microprobe… more
Date: January 1, 1991
Creator: Janssens, K. H.; van Langevelde, F.; Adams, F. C.; Vis, R. D.; Sutton, S. R.; Rivers, M. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of monazite, zircon, and apatite from the southeastern Piedmont. National uranium resource evaluation program

Description: Two hundred sixty-three monazite, 191 zircon, and 16 apatite grains from 52 stream-sediment locations in the Southeastern Piedmont were analyzed by electron microprobe for one of the following suites of elements: Ca, La, Ce, Pr, Nd, Sm, Eu, Gd, Er, Dy, Y, Th, U, P, and F, or Ca, La, Ce, Fe, Er, Hf, Y, Th, U, P, Zr, Mg, Al, and Si. Monazite samples that had high uranium or thorium content and zircon samples that had high hafnium or iron content from a total of six locations were reanalyzed to co… more
Date: December 1, 1981
Creator: Karfunkel, B S; Fay, W M & Price, V Jr
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Review of geochemical measurement techniques for a nuclear waste repository in bedded salt

Description: A broad, general review is presented of geochemical measurement techniques that can provide data necessary for site selection and repository effectiveness assessment for a radioactive waste repository in bedded salt. The available measurement techniques are organized according to the parameter measured. The list of geochemical parameters include all those measurable geochemical properties of a sample whole values determine the geochemical characteristics or behavior of the system. For each tech… more
Date: May 22, 1980
Creator: Knauss, K.G. & Steinborn, T.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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